ATBECHDEESFRGBGRITLILUNLSE0281239EUROPEAN PATENT APPLICATIONA319880921EP8830071019880128188218719870128JP1988092119883819880907198836 6C 07C 177/00 A 6A 61K 31:557 BenProstaglandins of the D series, and tranquilizers and soporifics containing the samefrProstaglandines D et tranquillisants et soporifiques les contenantdeD-Prostaglandine und ihre Anwendung in Tranquilizern und HypnotikumKabushiki Kaisha Ueno Seiyaku Oyo KenkyujoUeno, RyuzoUeno, RyujiKato, IchieOda, TomioATBECHDEESFRGBGRITLILUNLSE19880921198838

The present invention provides novel prostaglandins D, that is, 13,14-dihydro-15-keto-PGDs, which have an excellent sedative and sleep-inducing activity, and so they are useful for tranquilizer and/or soporifics.